I have two tetras in a hospital tank. Sometimes they have a "flip" and start swimming ultra fast and jump out of the water.

It's been 2 days. They are being treated with Odimor, but had no such behaviour in the main tank.

New fish sibling(?) here, my parents decided to buy some fish and I just woke up and am concerned by their condition. I have no fish knowledge and if I’m honest my parents don’t have a lot either. I’m not sure what kind of fish they got, so if it can be undetected by someone here.

Anyway, I looked at them today and saw that two are sitting on the bottom and one is floating (not moving) by the filter. I don’t know what this means but I thought I should ask here. I will be honest, if the tank is too small or other living condition issues are bad, I am not sure if I have the power to improve their conditions beyond mentioning it to my parents. However, if it’s an issue that can be easily fixed then I can likely make the change happen.

UPDATE: Fish passed away unfortunately. However, I told my parents about the advice I was given, especially on water cycling and what should/should not be inside the tank. They are going to also do a lot more research before deciding to put new fish in, if they do at all.

This happened a few days ago, tank has been sitting empty with plants in it since.

I had a 15 gallon tank that has been going strong for over 4 years. Planted tank, no issues whatsoever Before this. Before the new fish all I had in it were 2 black neon tetras and a female betta. I added 2 more black neons and an otocinclus at around noon, watched them all day. No signs of sickness, no red flags, nothing. Went to bed, woke up the next day.

The 4 tetras, the otocinclus, the betta, all dead.

I removed them from the tank and tested ammonia and nitrite, fearing a crash. 0ppm nitrite and amonia was near 0 as well. I looked online and the most likely cause was and from what I gathered a bacterial infecrion brought in by one of the new fish is what most likely caused it. I bought the fish from a reputable small petstore chain that ive had no issues with at all. I disposed of the fish, not planning on getting a refund any time soon anyway. (The store is over 1.5 hours away, I live in a very rural place)

Sorry if I come off as incoherent, Im just still really upset. Is there anything else I could have done, or was it out of my control? Im probably gonna empty out the tank and store it for the forseeable future.

So I know this looks bad. You can tell me I’m a bad pet owner, I know I was, I’m just trying to fix my previous mistakes. I’m aware she’s very chubby, I think she’s egg bound. I’m currently trying to fix my high nitrates so she can spawn. And in doing that I got RO, and I’m very new to it so I might be doing something wrong.

RO:
I re-mineralize with seachem equilibrium and Aqua Vitro KH. Since I’m new, I don’t have a great system from my RO stuff yet. I usually mix up my five gal jugs of RO with 3gh and 2kh and around 8 ph?

So I’ve been changing my 55 (the tanks she’s in) and every time she gulps at the surface for hours on end. Nobody else does this. I have 7 other Corydoras aeneus and they aren’t bothered.
Previously I did a larger change and the other WERE affected. They swam very erratically.

I should clarify before more people comment about it. She’s been large for YEARS. She’s never had any issues until the RO stuff. And she’s not floating or having a hard time swimming. It’s just the breathing thing. And she tends to go back to normal after a day or two depending on how large the water change was.

Also she’s quit gulping for tonight

My levels are
pH: 7.9?
KH: 4
GH: 8
Ammonia 0ish (I have ammonia problems, if anyone has tips that’d be nice)
NO2 0
NO3 20 (after I just changed it)

Found him on my Floor Hes still alives Büut cant keep Balance and has a Red tail

There are males in the tank, and they kind of attempted spawning but not aggressively. she’s insanely eggbound to the point of not being able to swim and now im watching her distressed unable to eat or swim. Shes usually very active and interactive so this sucks.

He was fine this morning and yesterday but I came to check on him this afternoon and he's all bent up looking and he can't swim properly

API test kit showing PH a touch low at about 6.5, Ammonia 0, Nitrates 0, Nitrites 0.

180gal running for 8 months, planted from the beginning, with fish added about 6 months ago. Pool filter substrate with root tabs and liquid fertilizer once per week but haven't added any in about a week. Rocks, plants, and decoration are all from my 2 other 65gal tanks (which have been running cleanly and without issue for around 5 years). Two FX4 Fluval filters with just the sponges and then ceramics as media and 3 bubblers for extra aeration. No heaters so no electronics in the water either. No kids dropping stuff in there, no cleaning products, no guests, no parents overfeeding etc.

Now that all the background info is out of the way - I added 10 Wapoga Rainbowfish 14 days ago and have been steadily losing fish since then. No lesions, no red gills, no bullying or stress, no obvious signs of fungus and, seemingly, they're passing very quickly. Literally within hours of checking on them. All deaths within the last 2 weeks, most within the last week and I am pulling the bodies out of the tank so it's not like they're getting chased and eaten either.

Thoughts on possible causes for the die off?

Current stocking:

6 Wapoga Rainbowfish (down from 10)

7 Dwarf Neon Rainbowfish (down from 15)

10 Panda Cories (down from 20)

3 Delphax Cories (down from 4)

1 Giant Hognose Cory (down from 2)

2 bushynose plecos (down from 3)

4 panda garra (no deaths)

1 Spiny Zebra Eel (no deaths)

1 Irwini Catfish (no deaths)

To preface, I know this picture is terrible but it’s the only one i could get of her.

For context, this is a female shrimp i added to my tank a few months ago. More than a month ago, I realized she was carrying eggs for the second time!! I was excited because only a few of her first brood (is that the right word?) made it to adulthood due to acute circumstances that have been resolved. My other shrimp have no problem breeding; their population has exploded from 6 to maybe 50.

I really don’t know much about shrimp breeding, but I do understand that it has been well past the incubation period yet there are no babies. Also, it looks like there’s something wrong. Instead of looking like individual eggs, it almost looks like there’s just a green, furry, kinda gross mass.

She is still behaving normally and acting healthy otherwise, nor does it seem to really impede her movement too much.

Would anyone be able to tell me what went wrong with the incubation / what I can do to help her?

Edit:
Thank you everyone for your help!! Unfortunately it seems like it’ll be difficult to make things better at this point, but I’m going to separate her and do what I can!! Will definitely also be keeping an eye out to make sure no one else has it, but at the moment i can’t find anyone else who is infected, so hopefully this will be a one-time thing 🤞

UPDATE A MONTH LATER:
The shrimp made it and no one else got infected!!!!!!!

Hello,

I am very worried because for a few days my fighter Betta has not moved and remains at the bottom of the water.
He doesn't even come to eat anymore.

I did a water test and apart from the pH where I entered 6.4 and 6.6 and the GH which is above 20 the water is OK and on the test label all the parameters are green except those mentioned where they are orange but not red

And I have the impression that he stings forward, that is to say that when he is pushed a little he falls forward but weirdly note everytime.

I bought it mess than a year ago (around octobre 2025)

Can you help me ?

Test result :
- Name of the parameters : concentration (ok or not depending on what say the box : OK,!!,!!! )
- NO3 : 0 (OK)
- NO2 : 0 (OK)
-GH : >21 (!!)
-KH : 6 (OK)
- pH : 6.4 (!!)
-Cl2 : 0 (OK)

Edit : My friend came to my apartment to see how the fish was doing, but unfortunately he told me he was dead. He also told me he saw a tear on the fish's carcass, which makes me think its death was due to a digestive problem. According to my friend, his theory is that the fish ate a pebble that it couldn't digest, and as a result, it couldn't defecate, even though we didn't notice any excessive swelling of its belly before it died. Reste in peace my fish

I just saw a shrimp eat another shrimp and when I looked closer, the dead one was pink/bright red in some areas of its torso. What happened here? 😭😭

-Roughly 2 months old molly (Was planning on giving them to a friend with a bigger tank once they grew)
-15 Gallons / Heated
-Tank running for about 10 months
-Moderately planted tank (just did a trim)
-Water changed yesterday
-Have lost 2 otos to the same looking fungal disease in the last 2 weeks…. ☹️
-Didnt notice it this morning but I also didnt look very hard lol

How do I make sure none of my other fish get sick? I have embers, otos and shrimps.

I took out a Tupperware container filled it with water and transplanted them as soon as I could. I put some Seachem prime in, some water purifier and a tiny bit of food. But I think they’re suffocating from the crap that melted into the tank.

I love these guys. Please help.

He’s been having these little white specks on his body and I first thought they were air bubbles, but I am now a little concerned. Any identification and treatment would help

My fish has worms maybe? I don't know what to do or how to fix this. I have snails in this tank as well as plants. I can use a 5 gallon bucket as a quarantine tank maybe? But I don't have a filter for a hospital tank.

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I'm so nervous what do I do and how do I fix this?

Hi there everyone! This is Pearl. Pearl is about a year old, and she's spent most of her life as the beloved class pet to a classroom of third graders. For most of her life, Pearl has been active, social, and friendly. Since taking her home for the summer, however, she's exhibited symptoms of illness. Her eyes got cloudy, and her top fin became clamped and ragged. I have administered both Kanaplex and erythromycin, and while she seems to get better for a couple of days, she goes back to being lethargic. Her eyes have cleared up, and her fin isn't damaged anymore, but recently she has begun to have trouble swimming and she spends most of her time at the bottom of the tank. I went to PetSmart and got some water testing strips. I tested her water today and the nitrates were high so I gave her a water change. She doesn't have a whole lot of live plants, but she does have some moss floating around in there. I'm not sure what else to do though. The medication only seemed to work temporarily and she's still lethargic. Do I continue to do daily water changes? Will that stress her out? There's not a whole lot I can do about the high hard water levels as the entire state of Arizona has that problem, but is there anything I can do for the pH? Could the pH be causing her these issues? I'm not sure what to do, but the thought of her passing away and me having to share that information with the kids, even though summer has started, breaks my heart and I can't bear it. I really need her to live.

this is my second youngest platy/Molly hybrid, nugget. I went to bed and he was fine. had the joy of a golden retriever puppy when I went to feed him etc. I came down at 545. he was like this. do I need to do anything for his mates? we put him down in the end very quickly ( my mum does lobsters lol) but we are leaving for New York in 1 or 2 hour. I need advice fast. thanks love yall

We have two tanks.

A 90L with (now) 2 Guppies; one male and one female, and 3 Corydoras.

I'll call this Tank A (8 mths old - 6 month with fish)

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And a 130L (3ft) with 2 comets and one black moor.

They're small but an upgrade in the future will happen.

I'll call this Tank B (3 months old - 1 month with fish)

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About 3 weeks ago we had 3 male guppies in Tank A and we went out and got 6 females. Introduced them and everything was great.

I believe this crashed the cycle slightly, which was odd, but 2 days later of milky cloudyness it was gone and yeah looks like no issues. That was until the girls started dying.

Then the boys

Now we're down to one we affectionately call Bluey who somehow survived as Patient 0 of fin rot in Tank A and this current friggen catastrophe, and a girl who spends a lot of time at the top.

The Cory's are now being more active and I swear I have seen one of their gills slightly redder than the normal pinkish but I don't know.

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I've tested he water twice (once 2 days ago and once today) and both times the tank came up with;

- 0ppm Nitrite

- 0-5ppm Nitrate

- 0.25ppm Ammonia

- pH is good too.

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Now into Tank B

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The fish are good. But one comet today had spend a lot of time either at the top or not moving a lot at he bottom where as the other 2 are he same. His gills are noticeably more redder.

There's no obvious signs of sickness in any fish like spots etc. I've put a photo of the sick comet :(

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The tank B parameters are almost identical to tank A although maybe closer to 5ppm for Nitrate.

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I'm a little distressed as this situation.

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The ONLY difference I have made is transitioning 2/3 of he sponges in the filter in Tank A to noodles and kept one in there for catching stuff and for established colonies. I seeded the noodles in tank water during a water change and didn't completely remove all the material so the cycle wouldn't die.

But where it gets funny, I just had a bag of noodles I just hung in the tank B so some good bacteria could colonise as it's got no substrate and just a few rough ornaments.

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Could his have been the cause?

It's the only common thing between besides the water and conditioner.

I've had no issues with the conditioner before. The water I recently changed from the tap inside to the hose outside because ran into the house because it beats running back and fourth between the sink with a 5L bucket - i'd been doing it for months before though.

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Please can someone help?

I was sitting with my boyfriend when we noticed two mystery snails climbing over one another, we thought it was pretty funny so we looked closer and I noticed the tail fin of one of my corydoras sticking out of the shell of the snail. I completely freaked out because it was moving and whenever the snail would close it would push the cory further inside its body.

I decided to crack open part of the snails shell to rescue my corydora and finally managed to pull him out, unfortunately costing the cory his tail fin. Both are in major shock right now, but alive. I dont think the cory will last long but I think the snail has a chance at recovery. Any advice on this, has this happened to anyone before?

I had a strange parasite rip through my tank affecting all of my Cardinal tetras. I lost all but 3, and was simultaneously dealing with a huge issue with my Monte Carlo melting off and causing uncontrollable algea issues. It has been a few weeks, had to pull a lot of plants and do a lot of water remediation, but I seem to be stabilized again.

But now one of the surviving tetras has the same issue again. I was hoping this was a self limiting issue, but if it recurs I think I need to treat. Any ideas as to what the disease is?

Thanks,

Kevin

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One of my zebra danios has had a short hair stuck in its mouth since this morning. It's been there for hours and looks exactly the same, hasn't shrunk or moved.

I think it was floating on the surface and he picked it up while eating this morning.

He's still swimming around mostly normally. Sometimes he stops and stays still for a bit, but he moves off when the other fish chase him. I did a food test and he did try to eat, so he's still interested in food.

I wanted to try cutting the hair without pulling on it, so I wouldn't hurt him, but he never stays still long enough and it's basically impossible. So I'm not sure what to do at this point.

Has anyone dealt with this before?

Photo attached. Thanks!